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Using Satellite Imagery to Evaluate Precontact Aboriginal Foraging Habitats in the Australian Western Desert W

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Using Satellite Imagery to Evaluate Precontact Aboriginal Foraging Habitats in the Australian Western Desert W www.nature.com/scientificreports OPEN Using satellite imagery to evaluate precontact Aboriginal foraging habitats in the Australian Western Desert W. Boone Law1*, Peter Hiscock2, Bertram Ostendorf1 & Megan Lewis1 Modern satellite imaging ofers radical new insights of the challenges and opportunities confronting traditional Aboriginal ecology and land use in Australia’s Western Desert. We model the likely dynamics of historic and precontact desert land use using Earth observation data to identify the distribution of suitable foraging habitats. Suitability was modelled for an ideal environmental scenario, based on satellite observations of maximal water abundance, vegetation greenness, and terrain ruggedness. Our model shows that the highest-ranked foraging habitats do not align with land systems or bioregions that have been used in previous reconstructions of Australian prehistory. We identify impoverished desert areas where unsuitable foraging conditions have likely persisted since early in the last glacial cycle, and in which occupation would always have been rare. These fndings lead us to reconsider past patterns of land use and the predicted archaeological signature of earlier desert peoples. Te ‘Western Desert’, as it is colloquially known, is one of the most arid and geographically remote regions of continental Australia. Understanding the dynamics of human ecology in this vast arid region is important to the investigation and interpretation of the continent’s Aboriginal archaeological record. Of Australia’s many desert areas, the Western Desert has been featured prominently in the development of many precontact human ecology models1–7. Te founding ‘Australian Desert Culture’ model1, created to explain human occupation of the Western Desert, was grounded in its use of the ethnographic record to characterise traditional land use practices, and continues to infuence research today. But modern research explores desert archaeology in diverse ways, using principles of biogeography, evolutionary biology and human behavioral ecology8–14. Tose models have enhanced our understanding of traditional forager subsistence and settlement practices, highlighting the complex nature of the Aboriginal land use. However, scale remains an issue in subsequent models, where broad, regional-level environmental characterizations have created low resolution understandings of resource availability and land use, thereby limiting their ability to measure changing land use practices over time and space. Australian researchers have increasingly employed spatial science methodologies to better portray ecological scenarios to interpret the archaeological past, although the ecological grain of such models has thus far been limited to coarse-scaled, continental-wide representations 13,15–18. Technological advances in spatial science and environmental remote sensing ofer a new level of sophistication to investigate past land use in a more spatially explicit way and at higher resolution than earlier models. With more than a quarter-century of Earth observa- tion imagery available in open access formats, it is easier than ever to access and process massive geospatial and remote sensing datasets into sophisticated models of human ecology. Our research takes advantage of these repositories, utilizing a number of freely available satellite image-derived products to investigate past Western Desert land use, including Geoscience Australia’s19 Water Observations from Space (WOfS), the United States Geological Survey’s20 Landsat 5 TM Normalized Diference Vegetation Index (NDVI) datacube, and the Japan Aerospace Exploration Agency’s21 Advanced Land Observing Satellite’s (ALOS) World 3D 30 m digital surface model. We use these remote sensing products to derive indicators of water accessibility, vegetation greenness, and terrain ruggedness. In combination, these variables are used to build a spatial ecological model that identifes suitable foraging habitats during times of maximum water abundance and above average vegetation health. Our 1School of Biological Sciences and Environment Institute, University of Adelaide, Adelaide, SA 5005, Australia. 2Geoscience and Archaeology, Australian Museum, 1 William Street, Sydney, NSW 2010, Australia. *email: [email protected] Scientifc Reports | (2021) 11:10755 | https://doi.org/10.1038/s41598-021-89642-1 1 Vol.:(0123456789) www.nature.com/scientificreports/ Figure 1. Location of the Western Desert in relation to continental Australia. Te bioregional boundaries of the Interim Biogeographic Regionalisation for Australia (IBRA)23 subregions are shown in relation to major land systems and desert regions. Te code keys to IBRA subregions are: CER01-Central Ranges (Mann-Musgrave), CER02-Central Ranges (Watarru), GAS02-Gascoyne (Carnegie), GID01-Gibson Desert (Lateritic), GID02- Gibson Desert (Dunefeld), GSD02-Great Sandy Desert (MacKay), GSD03-Great Sandy Desert (Ehernberg), GSD04-Great Sandy Desert (Amadeus), GSD05-Great Sandy Desert (Lake Bennett), GSD06-Great Sandy Desert (Lake Lewis), GVD01-Great Victoria Desert (Shield), GVD02-Great Victoria Desert (Central), GVD03-Great Victoria Desert (Maralinga), GVD04-Great Victoria Desert (Kintore), LSD01-Little Sandy Desert (Rudall), LSD02-Little Sandy Desert (Trainor), and NUL01-Nullarbor (Carlisle). Excavated rockshelter sites with long archaeological sequences (lime green) include: (1) Karnatukul (Serpent’s Glen), (2) Bushturkey-3, (3) Kaalpi, (4) Puntuntjarpa, (5) Parnkupirti, (6) Puritjarra, (7) Glen Tirsty, (8) Tjungkupu, and (9) Kulpi Mara. Map created in ESRI ArcGIS Desktop 10.5.1 (https:// deskt op. arcgis. com). Vector layers adapted from Creative Commons datasets (GEODATA Topo 250 K Series 3, Atlas of Australian Soils, and IBRA Version 7 Subregions) available at https:// data. gov. au. Montane upland layer based on terrain ruggedness raster (see “Methods” section). suitability model has implications for how we think about and test for land use histories, which we contextualize with previous ideas of Aboriginal subsistence and settlement in the Western Desert. Background and rationale Australia’s ‘Western Desert’ actually encompasses a diverse array of arid landscapes that are ofen discussed at diferent spatial scales. At a very generalised level, its prominent geographical areas include the Great Sandy Desert, Little Sandy Desert, Great Victoria Desert, Gibson Desert and the western portions of the Tanami Desert and the Central Ranges (Fig. 1). Alternatively, for analytical purposes, the Western Desert is also divided into 17 subregions under a nationally agreed upon framework known as the Interim Biogeographic Regionalisation for Australia (IBRA)23 (Fig. 1). Te boundaries of the IBRA subregions are spatially delineated using a combination of climatic, geological, landform, native vegetation and species information, and they are commonly used by the scientifc community to summarise and broadly investigate inter-regional biodiversity and ecosystem dynamics across the arid zone10,18,24–26. Te greater Western Desert, as defned here, spans nearly 1.1 million km 2, representing roughly 14.0% of the Australian land mass. Rainfall is seasonally unreliable, with median annual rainfall around 250 mm27. Ambient Scientifc Reports | (2021) 11:10755 | https://doi.org/10.1038/s41598-021-89642-1 2 Vol:.(1234567890) www.nature.com/scientificreports/ temperatures exceeding 35 °C occur more than 114 days annually and evapotranspiration is very high. Te West- ern Desert is riverless, lacking coordinated drainage or permanent freshwater lakes 26. Reliable water is largely confned to montane uplands or rocky outcrops, but there are exceptions. Springs, soaks and subterranean cham- bers are known to occur in palaeodrainage networks hundreds of kilometers from any rocky substrate28. In all other landforms, the availability of surface water is short-lived, ofen in playas29, and entirely contingent on rain. Tese environmental conditions presented severe challenges for human survival, and our concern is the implications of geographical variation in resource availability in those diverse desert environments for historic foragers. Was it possible for foragers to permanently occupy all desert areas or to inhabit them through all time periods4,9,30? For more than 50 years anthropological and ethnoarchaeological studies have characterized the nature of economy and social life in historical desert societies as small, nomadic family groups of 10–30 individuals who foraged opportunistically across large territories of land, moving and targeting resources fexibly in response to resource availability1. Groups occasionally gathered in larger congregations, but for short periods and only during times of increased water abundance1. Archaeologists typically presume the past total human population in the Western Desert had remained comparatively low throughout time, but increasingly some argue that population increased substantially in the past 2000 years17. It was initially argued that low population density and oppor- tunistic plant-based economic strategies are so essential in these deserts that they were always present in past behavioral systems, prompting the hypothesis that desert societies must have been culturally conservative and unable to change socially or economically over time1. However that conclusion is not supported by the serial changes observed in the archaeological record and models of desert conservatism are considered refuted 14,31,32. A more plausible hypothesis is that past behavioral
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